Tamperproof reclosable carton



June 29, 1965 G. 1.. MEYERs 3,191,848

TAMPERPROOF RECLOSABLE CARTON Filed Feb. 25. 1964 8 Sheets-Sheet l June29, 1965 G. l.. MEYl-:Rs

TAMPERPROOF RECLOSABLE CARTON 8 Sheets-Sheet 2 Filed Feb. 25, 1964 June29, 1965 G. l.. MEYERS 'I'NPERPROOF BECLOSABUE CARTON f8 She Bibs-Shadif5 Filed Feb. 25. '.1964

June 29, 1965 G. L. MEYERs 3,191,848

TAMPERPXOOF RECLOSABLE CARTON Filed Feb. 25. 1964 8 Sheets-Sheet 4 G. L.MEYERS TAMPERPROOF RECLOSABLE CARTON June 29, 1965 8 Sheets-Sheet 5 lF'iledv Feb. 25, 1964 June 29, 1965 G. MEYERs 3,191,848

TAMPERPROO1 RECLOSABLE CARTON Filed Feb. 25, 1964 8 Sheets-Sheet 6 I-une29, 1965 v l L. MEYERs 3,191,848

T AMPERPRooF REcLosABLE CARTON June 29, 1965 'i G. MEYERs 3,191,348

TAMPERPROOF RECLOSABLE CARTON Filed Feb. 25. 1964 8 Sheets-Sheet 8 Fig./9

3,191,348 TAMPERPRF RECLGSABLE CARTN George L. Meyers, Menasha, Win,assigner to American Can Company, New York, NBII., a corporation of New.Iersey Fiied Feb. 25, 1964, Ser. No. 347,654 7 Claims. (Ci. 229n-51)This invention relates to a tamperproof, reclosable carton which may bemade from a single blank. More specifically, the invention relates to acarton having a reclosable cover for packaging of foods such as icecream, bread and the like. This is a continuation-impart of my copendingapplication Serial No. 208,203, filed July 9, 1962.

It is now customary to package many products in a sealed carton whichwhen opened has a receptacle portion, and a cover portion havingdownwardly extending skirt portions which telescope over the cartonreceptacle portion when the carton is closed. Many such cartons embodyan opening means which when utilized detracts from the appearance of thereclosed carton. Also some of the cartons themselves are not tamperproofbut depend upon an overwrap material to provide tamperproofness. Thecovers on many of these cartons when opened swing free due to theresiliency of the carton material and the lack of adequate means forholding the cover down upon reclosing. From the standpoint of appearanceas well as operability, it is desirable to provide a carton constructionwhich is tamperproof and which has the opening means hidden beneath theskirt portion in the closed carton and also including means for insuringpositive reclosure of the carton.

It is therefore an object of the present invention tov provide atamperproof reclosable carton produced from a single blank and which hasa concealed opening means.

A further object of the present invention is to provide a tamperproofhinged cover carton `which has a positive reclosure means.

Yet another object of the present invention is to provide a hinged covercarton which employs an opening means which does not substantiallyweaken the initial carton construction and open prematurely.

Still another object of the present invention is to provide a hingedcover carton in which the hinged cover telescopes over the receptacleportion so that none of the flaps or panels protrude from the reclosedcarton.

Another object of the present invention is to provide a carton which canreadily be set up, filled and sealed by y automatic machinery.

Further details, advantages and objects will be apparent in thedescription of the drawings wherein:

FIGURE l is a plan View of a paperboard blank cornprising the iirstembodiment of this invention,

FIGURE 2 is a partial plan view of the blank of FIG- URE 1 partiallyfolded back upon itself, K

FIGURE 3 is a partial plan view of the blank folded and adhered to forma collapsed carton shell,

FIGURE 4 is another partial plan view of the collapsed carton shell,

FIGURE 5 is a fragmentary perspective view of the squared cartonpartially set up,

FIGURE 6 is a fragmentary perspective view of the closed and sealedcarton,

FIGURE 6A is a fragmentary sectional View of the closed and sealedcarton taken along line 6A-6A of FIGURE 6, l

FIGURE 7 is a fragmentary perspective view of the sealed carton after ithas been opened,

FIGURE 7A is a fragmentary sectional view of the opened carton takenalong line 7A--7A of FIGURE 7,

NUnited States Patent O FIGURE 7B is a fragmentary cross-sectional Viewof a modification of the carton shown in FIGURE 7A,

FIGURE 8 is a plan view of a paperboard blank of another embodiment ofthe invention,

FIGURE 9 is a plan view of the blank of FIGURE 8 partially folded backupon itself and adhered to form a collapsed carton shell,

FIGURE 10 is a perspective View of the squared carton partially set up,

FIGURE 11 is a fragmentary perspective view of the Y carton at anotherstage in the setting up,

FIGURE 12 is a fragmentary perspective view of the carton at a furtherstage in the setting up with one of the aps partially cut away,

Y FIGURE 13 is a fragmentary perspective View of the closed and sealedcarton,

FIGURE 14 is a fragmentaryperspective view of the sealed carton after ithas been opened,

FIGURE l5 is a fragmentary sectional view of the closed and sealedcarton taken along line 15-15 of FIGURE 13,

FIGURE 16 is a fragmentary sectional view of the opened carton takenalong line )I6-16 of FIGURE 14,

FIGURE 17 is a plan view of a paperboard blank of another embodiment ofthe invention,

FIGURE 18 is a fragmentary sectional view of an opened carton formedfrom the blank shown in FIG- URE 17,

FIGURE 19 is a fragmentary plan view of a modification ofthe blank shownin FIGURE l comprising still another embodiment of the invention,

FIGURE 2O is a fragmentary plan view of the reverse side of the blankshown in FIGURE 19,

FIGURE 2l is a fragmentary sectional View of a closed and sealed cartonformed from the blank shown in FIG- URES 19 and 20, and

FIGURE 22 is a fragmentary sectional view of the carton shown in FIGURE2l in opened condition.

Referring to FIGURE 1, therst embodiment comprises a blank A, preferablymade of paperboard. The blank is divided by score lines 11-27, andperforation lines 64I-63 and cut lines 2%-31 into hingedly connectedpanels and iiaps including glue flap 4t), rear panel 41, side panels 42and 44, front panel 43, top panel 45, bottom panels 46 and 4S, bottomflaps 47 and 49, end cover panels 50 and 52, front cover panel 51, endcover flaps 53 and S5, front cover flap S4, end opening flaps 56 and 58and front opening flap 57. Front opening flap 57 is divided byperforation line 61 into a lip portion 57a and a retaining portion 5711,the function of which will be described more fully hereinafter.

The blank A is formed into a glued carton shell by first applyingadhesive to the end opening iiaps 56 and 58, front opening flap 57, andglue Hap 40 in the areas indicated by stippling in FIGURE 1, folding endopening flaps 56 and Sti and front opening flap 57 with their respectiveattached elements,`namely end cover iiaps and 53, and front cover iiap54 outwardly about perforation lines 64I, 62 and 63 to overlie the outersurface of the side and front panels 42-44. The end cover panels Si) and52 and front cover panel 51 are folded back upon end opening flaps 56and 58 and front opening flap 57, respectively, along connecting scorelines Ztl-22 and adhered thereto. The blank at this stage of folding isshown in FIGURE 2 where the edges of end opening flaps 56 and 5S andfront opening flap 57 are shown in dotted outline. Next adhesive isapplied to the outer surface of glue flap 40, rear panel 41 with gluefiap 40 attached thereto along score line Il. is folded about score line12 to overlie side panel 42 and front panel 43 in part, and then sidepanel 44 is infolded about score line 14 so that Y U side panel 44overlies and becomes adhered to the adhesive bearing surface of glue ap40. In such condition, as shown in FIGURES 3 and 4, the shell may beshipped economically to the product packager for set-up, lling andsealing. FIGURES 3 and 4 show the opposite sides of the collapsed cartonshell.

FIGURE 5 depicts an initial stage in which the carton is squared andready for lling. When the shell is squared, panels 41, 42, 43 and 44 arepositioned consecutively at right angles to each other. Usually one endis closed and sealed, the carton filled and the other end closed andsealed. Since the sealing of the bottom is conventional and readilyaccomplished by infolding in order aps 47, 49, and panels 46 and 48,adhering the stippled area of panel 48 shown in FIGURE 1 to the outersurface of panel 46, reference is had to closing just the top of thecarton.

In closing the carton, an adhesive pattern indicated by the stippledarea in FIGURES l, 2, 4 and 5 is applied to the inner surface of toppanel 45. Obviously, as an alternative, the more diiiicult operation ofapplying the adhesive to the outer surfaces of end cover flaps 53 and 55and front cover iiap 54 could be employed inasmuch as the end result inthe completed carton is the same. After application of the adhesivefront cover flap 54 is infolded about score line 26 and end cover ilaps53 and 55 are infolded about score lines 27 and 25 so that the iiaps liein a plane perpendicular to the panels to which they are connected. Theclosure is completed by infolding top panel about score line 15 tooverlie and become adhered to the outer surfaces of the underlyingflaps.

In some instances it is advisable to use increased pressure wheneffecting the sealing of the top panel 45 to flaps 53, 54 and 55 toobtain a stronger bond between the adjacent carton surfaces. Thecollapsed shell in this case is placed over a mandrel, essentially equalin configuration to the inside of the completed carton, and flaps 53,54, 55 infolded to lie in contact with the mandrel. The top panel 45 isthen infolded and pressed tightly against the flaps. Asa result of theback or reinforcement giving to the carton ilaps by the mandrel,increased sealing pressure can be readily applied. The carton is thenremoved from the mandrel, filled and the other end is closed and sealed.

FIGURE 6 shows the closed and sealed carton, and FIGURE 6A shows a crosssection of the sealed carton. The multiple thicknesses of front coverpanel 51 and front opening iiap 57 give increased rigidity to the coverof the carton. Since the cover of the carton is attached at all foursides to the upper edges of the main and side panels, the carton istamperproof until detchrnent of the cover elements along the variouslines of weakness.

Referring to FIGURES 7 and 7A, in opening the carton the cover is raisedto initiate detachment of retaining portion 57b from lip portion 57aalong perforation line 61. Essentially simultaneously end opening iaps56 and 58 detach from side panels 42 and 44, respectively, alongperforation lines 60 and 63. As the cover is lifted, the openingpressure is resisted by the front opening flap 57 which tends to forcethe lower edge of front cover panel 51 adjacent score line 21 outwardlyprior to detachment of the two portions. The opened carton is shown inFIGURE 7 and FIGURE 7A shows a cross section of the opened carton withcoacting portions 57a and 57b. In the open position the carton iscomposed of a cover portion comprising top panel 45 hinged to rear panel41 and a hingedly connected cover skirt composed of cover panels -52,and a receptacle portion comprising front, rear, side and bottom panels.In reclosing the carton, the cover portion is lowered so that theappearance of the carton is essentially the same as prior to the opening. After reclosure, the adjacent edges of portions 57a and 57b abutforming a cover lock which retains the cover firmly in a closedposition.

It is, of course, recognized, as shown in FIGURE 7B, that the lipportion 57a may be iixedly adhered to the outer surface of frontreceptacle panel 43 and retaining portion 5"/'b left to hingedly swingabout score line 21. The locking action of this form of tamperproofcarton is essentially the same as that of the tamperproof carton shownin FIGURE 7A although the locking portions are reversed.

In the modified embodiment depicted in FIGURES 8-16 the shape of theiiaps and panels as well as the order of folding is altered. Referringfirst to FIGURE 8, a blank B is divided by score lines 10ft-113, cutlines 114-119 and perforation line 129 into hingedly connected panelsand flaps including opening flap 130, front panel 131, bottom panel 132,rear panel 133, top panel 134, front cover panel 13S, end cover panels136 and 145, end tabs 13'7 and 144, outer end tiaps 138 and 143, innerend flaps 139 and 142, and glue flaps 140 and 141. Front opening iiap131) is divided by perforation line 121 into retaining portion :1 andlip portion 131th, the function of which is similar to portions 57a and57b of the first embodiment and will be described more fullyhereinafter.

The blank 13" is formed into a glued carton shell by first applyingadhesive to opening flap 130, in the area indicated by stippling inFIGURE 8, folding rear panel 133 with the elements attached theretoabout score line 11.1 to lie superposed on bottom panel 132 and adheringfront cover panel 135 to the adhesive bearing surface of opening flap13). The blank at this stage of folding is shown in FIGURE 9 as acollapsed carton shell, which may be economically shipped in suchcondition to the product packager for set-up, filling and sealing.

FIGURE l0 depicts an initial stage in which the carton is squared andready for lling. When the shell is squared, panels 131, 132, 133 and 134are positioned consecutively at right angles to each other. Usually oneend is closed and sealed, the carton filled and the other end closed andsealed. Since the closing and sealing steps are the same for both endsof the carton, reference is had to closing just one end of the carton.

In closing the carton, adhesive is applied to the outer surface of innerend fiap 139 in the stippled area shown in FIGURE l() and the ap 139 isinfolded about score line 101 to position it perpendicularly to bottompanel 132. Next, end tab 137 is infolded to overlie and become adheredto the adhesive bearing outer surface of inner end flap 139 as shown inFIGURE l1. Opening ap 130 and adhered front cover panel 135 are thenfolded down to lie parallel to front panel 131 while adhesive is appliedto the outer surface of glue flap 140 and the flap infolded about scoreline 100 to lie superposed on inner end iiap 139. Then end cover panel136 is folded down about score line 104 to overlie portions of end tab137 and inner end flap 139 and become adhered to glue flap 140 as shownin FIGURE 12. The closure is completed by applying adhesive to outer endflap 138 in the area indicated by the stippling in FIGURE l1 and theninfolding outer end flap 138 and adhering it to end tab 137 and innerend flap 139. The closed and sealed carton is shown in FIGURE 13. In theclosed and sealed carton the downwardly projecting free edge portions ofend cover panels 136 and 145, respectively, are positioned in frictionalcontact between inner end iiaps 139, 142, respectively, and outer endaps 138, 143, respectively. FIGURE l5 shows a cross section of theclosed carton illustrating the tamperproof construction of the carton.It will be noted that prior to the opening of the closed carton, theretaining portion 13061 and lip portion 13011 are detachably connectedto each other.

Referring to FIGURES 14 and 16, in opening the carton the cover israised to initiate detachment 0f retaining portion 13th: from lipportion 13% along perforation line 121. As the cover is lifted, theopening pressure is resisted by the opening flap 139 which tends toforce the lower edge of front cover panel 135 outwardly prior todetachment of the two portions. In the open position the carton iscomposed of a cover portion comprising top panel 134 hinged to rearpanel 133 and a hingedly connected cover skirt composed of cover panels135, 136 and 145 and a receptacle portion comprising front, rear andbottom panels, and end flaps. To reclose the carton, the cover portionis lowered so that the appearance of the carton is essentially the sameas prior to the opening. After reclosure the adjacent edges of portions13de and 130b abut forming a cover lock which retains the cover iirmlyin a closed position.

In the embodiment shown in FIGURES 17 and 18 the arrangement of thelocking panels is altered.

Referring iirst to FIGURE 17, a blank C is divided by score lines2190-214, out lines 215-218 into hingedly connected panels and ilapsincluding front opening flap 219, front cover panel 220, glue aps 221and 222, top panel 223, end cover panels 2241.` and 22S, rear panel 225,end tabs 227 and 223, bottom panel 229, outer end aps 230 and 231, frontpanel 232, and inner end flaps 233 and 234.

Front opening flap 219 is divided by a perforation line 235 into lockingpanels including retaining portion 21951 and lip portion 21919, thefunction of whichvis similar to portions 57a and 57h of the firstembodiment and will be described more fully hereinafter.

Blank C is formed into a glued carton shell by first applying adhesiveto retaining portion 21% of opening Hap 219 as indicated by stippling inFIGURE 17, folding bottom panel 229 with the elements attached theretoabout score line 213 to lie superposed on rear panel 226, folding frontcover panel 226 with the elements attached thereto about score line 211and adhering the adhesive bearing surface, retaining portion 21911, tofront panel 232. The blank in this stage of formation is a collapsedcarton shell. The closing and sealing of this blank is similar to blankB.

FIGURE 18 shows the carton in opened condition. To open the carton thecover is raised to initiate detachment of lip portion 21% from retainingportion 219a along perforation line 235. As the cover is lifted, theopening pressure is resisted by the opening flap 219 which tends toforce the lower edge of front cover panel 22d outwardly prior todetachment of the two portions.

In the open position the carton is composed of a cover portioncomprising top panel 223 hinged to rear panel 226 and a hingedlyconnected cover skirt composed of cover panels 22d, 221, 222, 224 and225 and a receptacle portion comprising front, rear, bottom panels andend aps. To reclose the carton the cover portion is lowered so that theappearance of the carton is essentially the same as prior to opening.After reclosure the adjacent edges of portions 21% and 21% abut forminga cover lock which retains the cover rmly in a closed position.

Another embodiment may be made by slightly altering any of blanks A, Band C. An example of this embodiment, made by altering blank A, is shownin FIGURES 19, 20, 21 and 22. As seen in FIGURES 19 and 20 lto make thisembodiment, instead of having a perforation line such as 62 on blank A,a cut score line 62 is made and instead of perforation line 61 on blankA, a cut score line 61 is made on the reverse surface of front openingflap 57. These cut score lines extend about half-way through thethickness of the material as best seen in FIGURE 21. Glue is applied tothe entire front opening llap 57 as depicted by stippling in FIGURE 19and then the carton is closed as previously described for blank A.FIGURE 21 shows a cross section of the closed land sealed carton.

. 6 FIGURE 22 shows the carton in open position. To open the carton thecover is raised to sever the paperboard beginning at cut-score line 62and continuingA is also only one halfof the board thickness.

While, all of the embodiments shown have the cover portion hinged to thereceptacle portion at the upper edge of the rear panel, it is understoodthat, a hinge line may be provided on the top panel so that only aportion of the top of the carton is opened. Such a hinge line may bediagonally disposed across the top panel to form a reclosable cornercover portion.

It is further understood that locking portions may be provided on thesides of the carton as well as the front or on the sides alone.

The present invention provides a carton construction using. an integralblank. The carton can be readily set up, filled with the commodity to bepackaged, and sealed by automatic machinery. The carton is essentiallytamperproof because it cannot be opened without revealing the positionof entry. There are no loose flaps to either cause inconvenience inhandling and packaging or to distract from the appearance of the carton.The carton can be opened easily and upon reclosure the cover is held inplace by a retaining means. Numerous openings and reclosings of thecarton are not detrimental to the initial carton construction.

It is understood that the descriptions of the carton constructions givenherein are merely illustrative of the kessential features of theinvention, and are not limited and a cover portion which telescopes overthe upper edgesV of said receptacle portion; said receptacle portionhaving rst and second receptacle panels; said cover portion having a toppanel and rst and second cover panels forming skirt portions paralleland adjacent to the respective underlying rst land second receptaclepanels; a rst locking panel portion hingedly connected to one of saidfirst panels, a second locking panel portion detachably connected tosaid rst locking panel portion and being adhered to the other rst panel,said first and second locking panel portions lying between and parallelto the inner surface of said first cover panel and the outer surface ofsaid rst receptacle panel.

2. A tamperproof reclosable carton formed of a suitably cut and scoredblank having a receptacle portion and a cover portion which telescopesover the upper edges of said receptacle portion; said receptacle portioncomprising hingedly connected front, rear, side and bottom receptaclepanels, said cover portion comprising a top panel hingedly connected tothe upper edge of said rear panel, end cover panels and a front coverpanel all hingedly connected to said top panel and forming skirtportions parallel and adjacent to the respective underlying receptaclepanels, a first locking panel hingedly connected to one of said frontpanels; a second locking panel detachably connected to said iirstlocking panel Iand being adhered to the other front panel, said rst andsecond locking panels lying between and parallel to the inner surface ofsaid front cover panel and the outer surface of said front receptaclepanel.

3. A tamper-proof reclosable carton formed of a single suitably cut andscored blank having a receptacle portion and a cover portion whichtelescopes over the upper edges of said receptacle portion; saidreceptacle portion comprising hingedly connected front, rear, side andbottom receptacle panels; said cover portion comprising a top panelhingedly connected to the upper edge of said rear panel, end coverpanels and a front cover panel vall hingedly connected to said top paneland forming skirt portions parallel and adjacent to the respectiveunderlying receptacle panels; a first locking panel hingedly connectedto one of Isaid front panels; a second locking panel detachablyconnected along one edge to said lirst locking panel and being adheredto the other front panel, said rst and second locking panels lying in acommon plane between and parallel to the inner surface of said frontcover panel and the outer surface of said front receptacle panel.

4. A tamperproof reclosable carton formed of a single suitably cut andscored blank having a receptacle portion and a cover portion whichtelescopes over the upper edges of said -reptacle portion; saidreceptacle portion comprising hingedly connected front, rear, side andbottom receptacle panels; said cover portion comprising a top panelhingedly connected to the upper edge of said rear panel, end coverpanels and a front cover panel all hingedly connected to said top paneland forming skirt portions parallel and adjacent to the respectiveunderlying -receptacle panels; a lip element hingedly connected to theripper edge of said front receptacle panel; a retaining elementdetachably connected along one edge to said `lip element and beingattached along the opposite edge to said front cover panel, saidretaining element being adhered to the inner surface of said front coverpanel; .said -lip and retaining elements lying in a common plane betweenand parallel to the inner surface of said front cover panel 'and theouter surface of said front receptacle panel.

5. A tamperproof reclosable carton formed of a single suitably cut andscored blank having a receptacle portion and a cover portion whichtelescopes over the upper edges of said receptacle portion; saidreceptacle portion comprising hingedly connected front, rear, side andbottom receptacle panels; said cover porti-on comprising a top panelhingedly connected to the upper edge of said rear panel, end coverpanels `and a front cover panel all hingedly connected to said top paneland forming skirt portions parallel and adjacent .to the respectiveunderlying receptacle panels; a lip element hingedly connected to theupper edge of said front receptacle panel; a retaining elementdetachably connected along one edge to said lip element and being`adhered to the inner surface of said front cover panel; said lip andretaining element-s lying in a common plane between and parallel to theinner surface of said front cover panel and the outer surface of saidfront receptacle panel.

6. A tamperproof reclosable carton formed of a single suitably cut Iandscored blank having a receptacle portion and a cover portion whichtelescopes over the upper edges of said receptacle portion; saidreceptacle portion comprising hingedly connected front, rear, side andbottom receptacle panels; said cover portion comprising a top panelhingedly connected to the upper edge of said rear panel, end coverpanels and a front cover panel all hingedly connected to said top pane1and forming skirt portions parallel and adjacent to the respectiveunderlying receptacle panels; a retaining element adhered to the outersurface of said front receptacle panel; :a lip element hingedlyconnected to the front cover pane-l and being detachably connected alongone edge to said retaining element; said lip and retaining elementslying in a common plane between and parallel to the inner surface ofsia-id front cover panel and the outer surface of said front receptaclepanel.

7. A tamperproof reclosable carton formed of la single suitably cut andscored blank having a receptacle portion 'and a cover portion whichtelescopes over the upper edges of said receptacle portion; saidreceptacle portion comprising hingedly connected front, rear, bottom anda pair of side receptacle panels, said cover portion comprising a toppanel hingedly connected to the upper edge of said rear panel, a frontcover panel and a pair of end cover panels all hingedly connected tosaid top panel and forming skirt portions parallel and adjacent `to therespective underlying Ireceptacle panels; a lip element hingedlyconnected to the upper edge of each of said side receptacle panels, aretaining element detach-ably connected along one edge to each of thelip elements and being adhered to the inner surface of each of `the endcover panels, said lip and retaining elements lying between and parallelto the inner sur-face of said end cover panels and the outer surface ofsaid side receptacle panels.

References Cited by the Examiner UNITED STATES PATENTS 1,130,271 3/15Hammond 229--45 1,992,222 2/35 yLa Grua 229-51 2,181,837 'l1/39 Snyderet al. 229-51 2,246,484 6/ 41 Frieders 229-51 2,361,597 10/44 Buttery229-51 2,396,310 l3/ 46 Yungblut 229-51 2,557,914 6/51 Miller 229-51FRANKLIN T. GARRETT, Primary Examiner.

1. A TAMPERPROOF RECLOSABLE CARTON FORMED OF A SUITABLY CUT AND SECOREDBLANK HAVING A RECEPTACLE PORTION AND A COVER PORTION WHICH TELESCOPESOVER THE UPPER EDGES OF SAID RECEPTACLE PORTION; SAID RECEPTACLE PORTIONHAVING FIRST AND SECOND RECEPTACLE PANELS; SAID COVER PORTION HAVING ATOP PANEL AND FIRST AND SECOND COVER PANEL FORMING SKIRT PORTIONSPARALLEL AND ADJACENT TO THE RESPECTIVE UNDERLYING FIRST AND SECONDRECEPTACLE PANEL; A FIRST LOCKING PANEL PORTION HINGEDLY CONNECTED TOONE OF SAID FIRST PANELS, A SECOND LOCKING PANEL PORTION DETACHABLYCONNECTED TO SAID FIRST LOCKING PANEL PORTION AND BEING ADHERED TO THEOTHER FIRST PANEL, SAID FIRST AND SECOND LOCKING PANEL PORTIONS LYINGBETWEEN AND PARALLEL TO THE INNER SURFACE OF SAID FIRST COVER PANEL ANDTHE OUTER SURFACE OF SAID FIRST RECEPTACLE PANEL.